Explain the various sources of teratogens and their effects. Describe the process of teratogenesis and the mechanism of action.

Teratogens are environmental agents that can cause developmental abnormalities in a fetus. These agents include chemicals, drugs, pollutants, and physical factors that interfere with normal embryonic and fetal development. In environmental toxicology, the study of teratogens is crucial for understanding the impact of pollutants on reproductive health and congenital disorders. Various sources of teratogens can be classified based on their origin, exposure route, and mechanism of action.  

### Sources of Teratogens  

1. Chemical Teratogens  
   - Industrial Pollutants: Heavy metals such as mercury, lead, cadmium, and arsenic are released from industrial activities. These metals can cross the placenta and cause severe birth defects, including neurodevelopmental disorders and organ malformations.  
   - Pesticides and Herbicides: Agricultural chemicals like DDT, glyphosate, and organophosphates are known teratogens. They can interfere with hormonal regulation and cellular differentiation in embryos.  
   - Plasticizers and Endocrine Disruptors: Bisphenol A (BPA) and phthalates, found in plastics and consumer products, mimic estrogenic activity, leading to reproductive anomalies and fetal growth retardation.  
   - Pharmaceuticals: Drugs such _________ ______ ________ _______ __________ ______ _______ __________ ____.
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